#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
百度网盘客户端实现
提供百度网盘的完整功能实现
"""

import os
import json
import time
import hashlib
import logging
import requests
from typing import Dict, List, Optional, Any, Union, BinaryIO
from ..base_client import BaseCloudClient
from .file_operations import FileOperations
from .upload_operations import UploadOperations


class BaiduClient(BaseCloudClient):
    """百度网盘客户端"""
    
    def __init__(self, access_token=None, app_id=None, app_key=None, 
                 secret_key=None, session_file=None, logger=None):
        """初始化百度网盘客户端
        
        Args:
            access_token: 访问令牌
            app_id: 应用ID
            app_key: 应用密钥
            secret_key: 应用密钥
            session_file: 会话文件路径
            logger: 日志记录器
        """
        super().__init__()
        self.access_token = access_token
        self.app_id = app_id
        self.app_key = app_key
        self.secret_key = secret_key
        self.session_file = session_file
        self.logger = logger or logging.getLogger(__name__)
        
        # 初始化会话
        self.session = requests.Session()
        self.session.headers.update({
            'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36',
            'Accept': 'application/json, text/plain, */*',
            'Accept-Language': 'zh-CN,zh;q=0.9,en;q=0.8',
        })
    
    def get_provider_name(self) -> str:
        """
        获取云盘提供商名称
        
        Returns:
            str: 提供商名称
        """
        return 'baidu'
        
        # 登录状态
        self.is_logged_in = False
        
        # 初始化操作模块
        self.file_ops = FileOperations(self)
        self.upload_ops = UploadOperations(self)
        
        # 加载会话
        if session_file and os.path.exists(session_file):
            self.load_session()
    
    def login(self, username: str = None, password: str = None) -> bool:
        """登录百度网盘
        
        Args:
            username: 用户名（百度网盘使用OAuth，此参数暂时保留）
            password: 密码（百度网盘使用OAuth，此参数暂时保留）
        
        Returns:
            bool: 登录是否成功
        """
        if self.access_token:
            # 验证access_token是否有效
            if self.check_login_status():
                self.is_logged_in = True
                return True
        
        # TODO: 实现OAuth授权流程
        self.logger.warning("百度网盘需要通过OAuth授权获取access_token")
        return False
    
    def check_login_status(self) -> bool:
        """检查登录状态
        
        Returns:
            bool: 是否已登录
        """
        if not self.access_token:
            return False
        
        try:
            url = "https://pan.baidu.com/rest/2.0/xpan/nas"
            params = {
                'method': 'uinfo',
                'access_token': self.access_token
            }
            
            response = self.session.get(url, params=params)
            if response.status_code == 200:
                result = response.json()
                if 'errno' not in result or result['errno'] == 0:
                    return True
        except Exception as e:
            self.logger.error(f"检查登录状态失败: {e}")
        
        return False
    
    def logout(self) -> bool:
        """登出
        
        Returns:
            bool: 登出是否成功
        """
        self.is_logged_in = False
        self.access_token = None
        
        # 清除会话文件
        if self.session_file and os.path.exists(self.session_file):
            try:
                os.remove(self.session_file)
            except Exception as e:
                self.logger.error(f"删除会话文件失败: {e}")
        
        return True
    
    def get_files(self, folder_id: str = None, page: int = 1, 
                 page_size: int = 100) -> Optional[List[Dict[str, Any]]]:
        """获取文件列表
        
        Args:
            folder_id: 文件夹路径，None表示根目录
            page: 页码
            page_size: 每页数量
        
        Returns:
            List[Dict[str, Any]]: 文件列表
        """
        return self.file_ops.get_files(folder_id or "/", page, page_size)
    
    def get_file_info(self, file_id: str) -> Optional[Dict[str, Any]]:
        """获取文件信息
        
        Args:
            file_id: 文件ID或路径
        
        Returns:
            Dict[str, Any]: 文件信息
        """
        return self.file_ops.get_file_info(file_id)
    
    def create_folder(self, name: str, parent_id: str = None) -> Optional[Dict[str, Any]]:
        """创建文件夹
        
        Args:
            name: 文件夹名称
            parent_id: 父文件夹路径，None表示根目录
        
        Returns:
            Dict[str, Any]: 创建成功返回文件夹信息，失败返回None
        """
        if not self.check_login_status():
            return None
        
        if parent_id is None:
            parent_id = "/"  # 根目录
        
        folder_path = f"{parent_id.rstrip('/')}/{name}"
        
        url = "https://pan.baidu.com/rest/2.0/xpan/file"
        params = {
            'method': 'create',
            'path': folder_path,
            'isdir': 1,
            'access_token': self.access_token
        }
        
        try:
            response = self.session.post(url, data=params)
            if response.status_code == 200:
                result = response.json()
                if result.get('errno') == 0:
                    self.logger.info(f"文件夹创建成功: {name}")
                    return {
                        'id': result.get('fs_id'),
                        'name': name,
                        'path': folder_path,
                        'type': 'folder',
                        'create_time': int(time.time())
                    }
                else:
                    self.logger.error(f"创建文件夹失败: {result.get('errmsg')}")
        except Exception as e:
            self.logger.error(f"创建文件夹请求失败: {e}")
        
        return None
    
    def delete_folder(self, folder_id: str) -> bool:
        """删除文件夹
        
        Args:
            folder_id: 文件夹路径
        
        Returns:
            bool: 删除是否成功
        """
        return self.file_ops.delete_file_or_folder(folder_id)
    
    def rename_folder(self, folder_id: str, new_name: str) -> bool:
        """重命名文件夹
        
        Args:
            folder_id: 文件夹路径
            new_name: 新名称
        
        Returns:
            bool: 重命名是否成功
        """
        return self.file_ops.rename_file_or_folder(folder_id, new_name)
    
    def upload_file(self, file_data: Union[str, bytes, BinaryIO], filename: str, 
                   parent_id: str = None, overwrite: bool = True) -> Optional[Dict[str, Any]]:
        """上传文件
        
        Args:
            file_data: 文件数据（文件路径、字节数据或文件对象）
            filename: 文件名
            parent_id: 父文件夹路径，None表示根目录
            overwrite: 是否覆盖同名文件
        
        Returns:
            Dict[str, Any]: 上传成功返回文件信息，失败返回None
        """
        return self.upload_ops.upload_file(file_data, filename, parent_id or "/", overwrite)
    
    def download_file(self, file_id: str, save_path: str = None) -> Union[bool, bytes, None]:
        """下载文件
        
        Args:
            file_id: 文件路径
            save_path: 保存路径，None表示返回文件内容
        
        Returns:
            Union[bool, bytes, None]: 保存到文件返回bool，返回内容返回bytes，失败返回None
        """
        return self.file_ops.download_file(file_id, save_path)
    
    def delete_file(self, file_id: str) -> bool:
        """删除文件
        
        Args:
            file_id: 文件路径
        
        Returns:
            bool: 删除是否成功
        """
        return self.file_ops.delete_file_or_folder(file_id)
    
    def rename_file(self, file_id: str, new_name: str) -> bool:
        """重命名文件
        
        Args:
            file_id: 文件路径
            new_name: 新名称
        
        Returns:
            bool: 重命名是否成功
        """
        return self.file_ops.rename_file_or_folder(file_id, new_name)
    
    def move_file(self, file_id: str, target_folder_id: str) -> bool:
        """移动文件
        
        Args:
            file_id: 文件路径
            target_folder_id: 目标文件夹路径
        
        Returns:
            bool: 移动是否成功
        """
        return self.file_ops.move_file(file_id, target_folder_id)
    
    def copy_file(self, file_id: str, target_folder_id: str, new_name: str = None) -> Optional[Dict[str, Any]]:
        """复制文件
        
        Args:
            file_id: 文件路径
            target_folder_id: 目标文件夹路径
            new_name: 新文件名，None表示保持原名
        
        Returns:
            Dict[str, Any]: 复制成功返回新文件信息，失败返回None
        """
        return self.file_ops.copy_file(file_id, target_folder_id, new_name)
    
    def check_fast_upload(self, filename: str, file_size: int, file_md5: str, 
                         parent_id: str = None) -> bool:
        """检查文件是否支持秒传
        
        Args:
            filename: 文件名
            file_size: 文件大小（字节）
            file_md5: 文件MD5值
            parent_id: 父文件夹路径
        
        Returns:
            bool: 是否支持秒传
        """
        return self.upload_ops.check_fast_upload(filename, file_size, file_md5, parent_id or "/")
    
    def fast_upload(self, filename: str, file_size: int, file_md5: str, 
                   parent_id: str = None) -> Optional[Dict[str, Any]]:
        """执行秒传
        
        Args:
            filename: 文件名
            file_size: 文件大小（字节）
            file_md5: 文件MD5值
            parent_id: 父文件夹路径
        
        Returns:
            Dict[str, Any]: 秒传成功返回文件信息，失败返回None
        """
        return self.upload_ops.fast_upload(filename, file_size, file_md5, parent_id or "/")
    
    def _delete_file_or_folder(self, path: str) -> bool:
        """删除文件或文件夹
        
        Args:
            path: 文件或文件夹路径
        
        Returns:
            bool: 删除是否成功
        """
        if not self.check_login_status():
            return False
        
        url = "https://pan.baidu.com/rest/2.0/xpan/file"
        params = {
            'method': 'filemanager',
            'opera': 'delete',
            'filelist': json.dumps([path]),
            'access_token': self.access_token
        }
        
        try:
            response = self.session.post(url, data=params)
            if response.status_code == 200:
                result = response.json()
                if result.get('errno') == 0:
                    self.logger.info(f"删除成功: {path}")
                    return True
                else:
                    self.logger.error(f"删除失败: {result.get('errmsg')}")
        except Exception as e:
            self.logger.error(f"删除请求失败: {e}")
        
        return False
    
    def _rename_file_or_folder(self, path: str, new_name: str) -> bool:
        """重命名文件或文件夹
        
        Args:
            path: 文件或文件夹路径
            new_name: 新名称
        
        Returns:
            bool: 重命名是否成功
        """
        if not self.check_login_status():
            return False
        
        # 构造新路径
        parent_path = '/'.join(path.split('/')[:-1])
        new_path = f"{parent_path}/{new_name}" if parent_path else new_name
        
        url = "https://pan.baidu.com/rest/2.0/xpan/file"
        params = {
            'method': 'filemanager',
            'opera': 'rename',
            'filelist': json.dumps([{'path': path, 'newname': new_name}]),
            'access_token': self.access_token
        }
        
        try:
            response = self.session.post(url, data=params)
            if response.status_code == 200:
                result = response.json()
                if result.get('errno') == 0:
                    self.logger.info(f"重命名成功: {path} -> {new_path}")
                    return True
                else:
                    self.logger.error(f"重命名失败: {result.get('errmsg')}")
        except Exception as e:
            self.logger.error(f"重命名请求失败: {e}")
        
        return False
    
    def save_session(self) -> bool:
        """保存会话信息
        
        Returns:
            bool: 保存是否成功
        """
        if not self.session_file:
            return False
        
        session_data = {
            'access_token': self.access_token,
            'is_logged_in': self.is_logged_in,
            'timestamp': int(time.time())
        }
        
        try:
            os.makedirs(os.path.dirname(self.session_file), exist_ok=True)
            with open(self.session_file, 'w', encoding='utf-8') as f:
                json.dump(session_data, f, ensure_ascii=False, indent=2)
            return True
        except Exception as e:
            self.logger.error(f"保存会话失败: {e}")
            return False
    
    def load_session(self) -> bool:
        """加载会话信息
        
        Returns:
            bool: 加载是否成功
        """
        if not self.session_file or not os.path.exists(self.session_file):
            return False
        
        try:
            with open(self.session_file, 'r', encoding='utf-8') as f:
                session_data = json.load(f)
            
            self.access_token = session_data.get('access_token')
            self.is_logged_in = session_data.get('is_logged_in', False)
            
            # 检查会话是否过期（24小时）
            timestamp = session_data.get('timestamp', 0)
            if int(time.time()) - timestamp > 24 * 3600:
                self.logger.info("会话已过期")
                return False
            
            return True
        except Exception as e:
            self.logger.error(f"加载会话失败: {e}")
            return False